Did you take any additional cables out? I have forgotten to plug one of my 8-pin power cables back in before..... took me 3 hours to realize it too. This caused it to boot to bios then shut right back off.

You should be able to set CPU fan to Unmonitored, Is your pump running you might be overheating straight away causing the shut down.

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Did you take any additional cables out? I have forgotten to plug one of my 8-pin power cables back in before..... took me 3 hours to realize it too. This caused it to boot to bios then shut right back off.

Well, looks like it was a fluke. I actually have forgotten to plug in the 8-pin connector countless times, but it looks like it was nothing. I just started the computer again, and everything works fine.

I did shake the tower around quite a bit before that, so maybe the screw was causing a short...seems unlikely. Thanks for all the replies!